Kenra medicated anti-dandruff shampoo relieves itching and flaking of the scalp associated with seborrheic dermatitis and dandruff. This ultra-gentle formula leaves hair silky and manageable, while helping to prevent further dandruff development. To use: Shake Well. Wet hair, apply, lather and leave on hair for several minutes. Rinse and repeat. Use at least twice a week or as directed by a physician. When a conditioner is needed, it is recommended to use Kenra Daily Provision Lightweight, Leave-in Conditioner.